Grinding machine



June 11, 1935.

cfBobTH ET AL GRINDING MACHINE Filed March 28, 1930 3 Sheets-Sheet l I llu dftozmuq June 11, 1935. c, BOQT Er A 2,004,426

GRINDING MACHINE Filed March 28, 1930 3 Sheets-Sheet 3 Patented June 11,1935 I 2,004,426

TUNITED STATES PATENT OFFICE GRINDING MACHINE Clement Booth and Frederick S. Haas, Cincin c natl, Ohio, assignors to Cincinnati Grinders Incolil-iporated, Cincinnati, Ohio, a corporation of o Application March 28, 1930, Serial No. 439,778

18 Claims.- ((151-103) This invention relates to improvements in maend bearings 16 and IT for a spindle or shaft l8. chine tools and especially to improvements in cen- Secured to one end of spindle I8 is a grinding terless grinding machines. wheel l9 and the spindle has intermediate its An object of this invention is the provision of ends a pulley 20 for driving belt- 2'! whereby improved means for effecting the drive of the regthe same and grinding wheel l9 are rotated. 5

'ulating wheel, of acenterless grinder. The belt extends downwardly through the in- Another object of the invention is to provide an terior of the bed where it is trained about 9. improved mechanism for controlling the movedriving pulley 22 secured to counter shaft 23. ments of a movable member of a machine tool A main transmission belt 24 extends about a drivorganization such as the regulating wheel unit, of ing pulley mounted on the counter shaft 23 as 10 a centerless grinder. well as about a pulley 25 secured on the motor Another object of the invention is to providr; shaft 26 of motor 21. Through the transmission improved truing structure for dressing or truing belts 24 and 2| the spindle I8 is rotated at a q the active face of the wheel of a precisio}: grinding high or grinding rate of speed in a counter clockmachine. wise direction as indicated by the arrow 28 in 15 A further object of the invention is to provide Figure 8. a common source of power for controlling and ro- Supported by the bed at the other end thereof tating the various members and movements of a is a slide 29 having formed integral therewith machine tool organization. bearings 30 and 3| in which is journaled a shaft Other objects and advantages of the present inor spindle 32. The shaft or spindle 32 has se- 20 vention should be readily apparent by reference cured to its outer end a member 33 in the nature to the following specification considered in conof a wheel formed of suitable abrasive material. junction with the accompanying drawings form-' The spindle32 and wheel 33 are adapted to be ing a part thereof andit is to be understood that rotated in a counter clockwise direction as indiany modifications may be made within the struc. cated by the arrow 34 in Figure 8 at a speed rel- 25 tural details without departing from or exceeding atively slower than the speed of grinding wheel the Spirit f the invention H to control the rate of rotation of a work piece.

Figure l is a view of a device embodying this By this construction the adjacent surfaces of the ve o having Certain parts thereof shown in wheels l9 and 33 travel in opposite directions and section to more clearly illustrate the structure. the surfaces are spaced from one another to pro- 30 Figure 2 is a sectional view taken on line 2-2 vide a grinding throat in which the work piece of Fi ure 1. to be operated upon is positioned. To support Figure 3 is a sectional view taken on line 3-3 the work piece 35 for peripheral rotation during of Figure I grind g there is provided, subtending the grind- 35 Figure 4 is a. sectional view taken on line 4-4 ing t at, a work rest blade 36 adjustably secured 35 of Figure 3! by means of bolts or the like 31 to a block 38.

Figure Sisasectional view taken on line 55 of The rotation of the shaft or spindle 32 and Figure wheel 33 is effected by an hydraulic motor sei ur 6 is c ional view aken o linev 6-6 of cured to the end of the spindle 32 and indicated 40 ure 4. in general by the numeral 40 which comprises 40 Figure '7 is a sectional view taken on line 1- of a housing 4| having secured t it plate 42 carryu e ing interiorly of the'housin'g 4| a pair of studs Figure8is an elevation view of the device shown 43 and 44, Anti-friction bearings 45 and 46 in Figure 1 as seen from line 8-8 thereon, certain surround the studs having their outer races reparts have been broken y 0 o clear y ilceived respectively in counter bores formed in 45 lustrate the drive. motor gears 41 and 48. The gears 41 and 48 Figure 9 is a Sectional w en on lin 9 are in mesh with one another and are adapted to of Figure '7, and be rotated by hydraulic pressure to be later deure 10 is a diagrammatic Vi w illustrating scribed; The other ends of the gears 4'! and 48 the hydraulic circuit utilized with this invention. are respectively journaled in anti-frictionbear- 50 Thr u o the Several Views of d aw gs ings 49 and 50 carried by intermediate plate 5| similar reference characters are employed to depositioned b t housing 4| and t l housnote the same or similar parts. ing 52. Motor gear 4'! has secured centrally A device embodying this invention may comthereof the hub .53 of a spur gear 52' whereby the 5 prlsea bed or support l5 supporting on its upper gear 52 is rotated with and by gear 41. Meshing 55 with the gear 52' is a pinion 54 secured to the end of worm shaft 55 which has integral therewith a worm 56 for rotating worm wheel 58. The worm wheel 58 is loosely mounted near the end of the shaft or spindle 32. A clutch member 59 is secured to the worm wheel 58 and has clutch teeth 68 adapted to mesh with corresponding clutch teeth 6| formed on one end of shiftable clutch spool 62 slidably keyed to the shaft or spindle 32 so that when said clutch spool is rotated the spindle is correspondingly rotated.

The foregoing description deals with the rotation of the member or wheel 33 at a slow rate of speed to control the rotation of the work piece supported by the blade 36. In order to true or dress the active surface of this wheel it is desirable to rotate same at a much faster rate of speed which is accomplished by the following mechanism. Motor gear 48 has secured centrally thereof the stub shaft 63 integral with bevel gear 64 so as'to rotate with said pump gear 48'. Bevel gear 64 meshes with'a similar bevel gear 65 secured to clutch member 66 loosely mounted on spindle or shaft 32. Clutch member 66 is provided on its inner end with clutch teeth 61 adapted to be engaged by similar clutch teeth 68 formed on the other side of clutch spool 62. The clutch spool 62 is formed with a peripheral groove 69 receiving eccentric 18 formed onone end of shaft 1|. The shaft H is journaled in the wall of housing 52 and has secured thereto exteriorly of the housing 52 a handle or the like 12. The handle 12 is adapted to be actuated through an arcof 180 degrees for shifting the clutch spool axially of the spindle 32 either to clutch teeth 68 and 6| or toclutch teeth 61 and 68.

To effect a rotation of motor gears 41 and 48 an hydraulic pump is provided having a sprocket 14 about which sprocket chain 15 extends. This sprocket chain also extends about a sprocket 16 secured to counter shaft 23. A suction pipe or conduit 11 extends from the pump 13 into a tank I or sump 18 for drawing therefrom suitable hydraulic medium preferably oil. The medium is discharged from the pump through conduit 19 to the main pressure line 88 from which branch conduit 8| conveys the medium into housing 4| for rotating the motor gears 41 and 48, and the spent medium flows from the pump housing-4| through conduit 82 to main exhaust line 83 for delivery back to the tank or sump 18.=. A 'valve, shown diagrammatically in Figure 10 and indicated by the numeral 83a, may be placed in the conduit 8| to control the flow of the medium therethrough and the rate of rotation of motor gears 41 and 48.

To effect a stock removal from the work piece the slide 29 and regulating wheel 33- are adapted to be actuated longitudinally of the bed to feed the work piece into the grinding wheel I9 and the slide comprises a bracket 84 depending therefrom having journaled therein the reduced end of an adjusting screw and guide rod 85 which can be locked against rotation as by the set screw I45 shown in Figure 2. A hand wheel 86 is se;

.cured to the end of the screw exteriorly of this in suitable anti-friction bearings carried by the upper portion of the bracket 98.

The piston 9| is adapted to be reciprocated through its cylinder by fluid pressure controlled and directed by the valve 92. The hydraulic medium passes from the main pressure line 88 into the valve chamber of valve 92'through port 96 therein. The medium then passes from valve chamber 95 through port 91 into conduit 98 for actuating the piston to the right as seen in Figure 5. The hydraulic medium in the cylinder 98a ahead of the piston is forced out through ports 99 and I88 to the hollow interior of piston guide rod I8I which forms a conduit therefor, to the coupling I82 where it is directed through conduit I83 to the valve chamber 95. A conduit I84 receives the medium from the chamber 95 thfough exhaust H8 and conveys it to the common discharge line 83 for delivery to the tank or sump '18. Projecting valve rod I43 bearing a handle or operating connection I44 serves to control the position of valve 92.

The piston 93 is provided interiorly thereof 7 be noted that the piston is at first actuated at a rapid rate through its cylinder until the said ports 99 are closed off thereby rapidly advancing the regulating wheel toward the grinding wheel.

At this time the regulating wheel and its supporting slide have been adjusted relative to the bed and grinding wheel to a position for feeding the work piece into the grinding wheel to effect a stock removal therefrom. Continued movement of piston 9| is now at a slow rate to correspondingly actuate the slide toward the grinding wheel for feeding work piece into the said grinding wheel.

The withdrawing of the regulating wheel from the grinding wheel is accomplished by shifting the valve 92 to a position to connect inlet port 96 with port I81 and connect port 91 with port I88.

At this time the enlarged portion I89 of the valve 92 closes off the exhaust port II8 leading to the conduit I84 so that the pressure entering the P cylinder 9811. by way of port 96 passes through port I81 and conduit III to the other side of the piston 9| for actuating same to the left as seen in Figure 5. At this time the medium ahead of the piston is forced out through conduit 98, port 91 and port I88 to freely flow through conduit II2 connected with the main discharge conduit for delivering the medium to the sump or tank 18.

The active surfaces of the wheels I1 and 33 are formed and reconditioned by an hydraulically controlled mechanism mounted on each side of the bed adjacent each wheel and the mechanisms being duplicates of one another it is deemed sufficient if but one of them be described in detail. The slide 29 has mounted thereon for movement therewith and relative thereto a slide II4 supporting the truing mechanism which comprises a cylinder 5 having mounted interiorly thereof a piston H6 and a piston rod H1. The rod II1 supports at its one end an adjustable tool carrier I I8 supporting a diamond or truingtool H9 and the other end of the carrier is provided with a threaded bore I28 threadedly receiving adjusting screw ML The diamond or truing' tool I I9 is shifted or actuated acr oss the active face of the wheel by the piston H8 which is moved by hydraulic pressure conveyed from the pressure line 80 through conduit I22 into valve chamber I23 containing shiftable valve spool I24 which, in the position shown in Figure 10, directsthe hydraulic medium through conduit I25 to one end of the piston cylinder H5. The hydraulic medium is forced out of the said cylinder H5 through conduit I26 to the valve casing I23. The hydraulic medium then passes through conduit I21 back to the tank or sump 18. To control the operative association of the diamond or truing tool HQ with the active face of the wheel, and epecially when it is desired to form or contour the said face of the wheel, the piston rod I I1 has secured thereto a follower I21 cooperating with a cam I28 secured to the bracket portion I29 of the bed or support I5. Contact between the follower I21 and cam I28 is maintained by hydraulic pressure from the main pressure line through conduit I 30 directed into one end of cylinder I3I which contains piston I32. The piston rod I33 carried by piston I32 extends through the guide portion I34 formed integral with the cylinder I3I. This cylinder is supported by the slide 29 and the piston therein tends to shift the slide I I4 relative to the slide 29 by having its piston rod constantly in abutment with the adjustable stop member I35 carried by the slide II4.

The valve I24 has extending therefrom a valve red I 36 having secured on its outer end acircumferentially grooved collar I31 receiving the forked end I38 of manually actuable lever. I39. This lever is pivoted intermediate its ends to a bracket I40 carried by the slide 29. A pair of adjustable dogs or" collars I are secured to the rod. having extending between them the outer extended end I42 of cam follower I21. Therefore, to effect a traverse movement of the diamond across the face of the wheel, the lever I39 is actuated to set valve I24 to effect said movement and as the piston and piston rod move carrying with it the same follower I21 the end thereof engages one of the dogs or collars I an hydraulic medium under pressure to various pistons or secondary motors.

What is claimed is:

1. In a centerless grinder the combination of a bed or support, a pair of opposed grinding and regulating members forming a grinding throat therebetween, means for supporting a work piece in the throat between the members, a counter shaft, a prime mover for rotating the counter shaft, transmission means extending froml the counter shaft to one of the members for rotating same, an hydraulic motor for rotating the other member, and means driven from the counter shaft for effecting a rotation of the hydraulic motor.

2. In a centerless grinder the combination of a. bed or support, a pair of opposed grinding and regulating members forming a grinding throat therebetween, means for supporting a work piece in the throat between the members, a counter shaft, a prime mover for rotating'the counter shaft, transmission means extending from the counter shaft to one of the members for rotating same, an hydraulic motor for rotating the other member, and means driven from the counter shaft for effecting a rotation of the hydraulic motor comprising a pump, an hydraulic. circuit from the pump to the motor and transmission means extending from the counter shaft to the pump, to operate same thereby.

3. In a device of the class described the combi-' 'by for effecting a stock removal from and controlling the rate of rotation of a work piece, means supporting one of the membersfor translation relative to the bed toward and from the other member, and hydraulic means for effecting said rotation and translation of one of the members.

4. In a machine tool organization the combination of a bed or support, a rotatable member carried thereby for translation relative thereto, an hydraulic motorv for effecting the rotation of the member, a motor for effecting the translation thereof, a pump for actuating the motors, and a common pressure line connecting the pump and motors.

5. In a machine tool organization the combination of a bed or support, a slide carried thereby for movement relative thereto, a member rotatand means for circulating'an hydraulic medium under pressure in the pressure line.

6. Ina machine tool organization the combination of a pair of opposed grinding and regulating members forming a grinding throat therebetween, a work support in the throat for supporting a work piece for operation thereon, means for truing the active face of the members, and an hydraulic motor for rotating one of the members at normal speed to control the rotation of a work piece and at .a much faster speed to true the said face,

said motor comprising a pair of pump gears connectable individually with the member for rotating same at said differential speeds.

7. In a device of the class described the combination of a bed, a pair of opposed members carried thereby, one for elfecting a stock removal from a work piece and the other forcontrolling the rate of rotation thereof, means for driving one of the members at a constant speed, and means for driving the other memberat a slow and a fast speed including an hydraulic motor, a pair of gears carried thereby, a direct connection between one of the gears and the member, and a worm and worm wheel connection between the other gear and the member, and means for rotating the gears.

8. In a machine tool organization the combination of a bed, a slide carried thereby for movement relative thereto, an adjusting screw for reciprocating the slide relative to the bed, a nut carried by the bed in threaded engagement with the screw, hydraulic means for rotating the nut,

, by the shaft is rotated at differential speeds. v

9. In a machine tool organization the combination of a bed, a slide carried thereby for movement relative thereto, a reciprocating motor, connections between the motor and slide whereby the reciprocations of the motor effect the translation of the slide, a rotatable shaft journaled in the slide, an hydraulic motor couplable with the shaft for rotating same thereby, and means for varying the coupling of the motor and shaft to effect a rotation of the shaft at differential speeds.

10. In a machine tool organization the combination of a bed, a slide carried thereby for movement relative thereto, a reciprocating motor, connections between the motor and slide whereby the reciprocations of the motor effect a translation of the slide, a rotatable shaft journaled in the slide, an hydraulic motor couplable with the shaft for rotating same thereby, means for varying'the coupling of the motor and shaft to effect a rotation of the shaft an differential speeds, and a pump for clrculating'an hydraulic medium to effect actuation of the slidev motor and rotation of the shaft motor.

11. In a machine tool organization thencombination of a bed, a slide carried thereby for movement relative thereto, an adjusting screw, a nut rotatably supported by the bed in threaded engagement with the screw, a reciprocating motor for rotating the nut to effect translation of the slide,a rotatable shaft journaled in the slide, an hydraulic motor couplable with the shaft for rotating same thereby, an hydraulic circuit, a pump for circulating a hydraulic medium through the vancing means and rotating shaft motor.

13. In a machine tool organization the combi-- nation of a slide, a bed therefore, hydraulic means for advancing the slide relative to the bed at rapid traverse and feed rates, a rotatable shaft carried by the slide, an hydraulic motor couplable with the shaft for rotating same thereby, a common source of power for actuating the slide motor and rotating shaft motor and means for automatically changing the rate of advance of the slide relative to the bed.

14. In a machine tool organization the combination of a bed, a slide carried thereby for movement relative thereto, a reciprocating motor for effecting the translation of the slide, a rotatable shaft journaled in the slide, an hydraulic motor for effecting said rotation of the shaft, a member carried by the shaft for rotation therewith, 'and an hydraulic mechanism for reconditioning the active face of the member carried by the shaft, 9. main pressure line containing an hydraulic medium under pressure, and branch conduits extending from the main pressure line to the reciprocating motor, the shaft rotating motor, and the hydraulic reconditioning means; I

15. In a centerless grinder the'combination of a bed or support, a grinding wheel carried thereby, a regulating wheel carried by the bed, a prime mover, a counter shaft driven by the prime mover, transmission means coupling the counter shaft with the grinding wheel for rotating same thereby, an hydraulic pump, transmission means coupling the pump with the counter shaft for driving same thereby, and means driven by the pump for effecting the rotation of the regulating wheel. 16. In a centerless grinder the combination of a bed or support, a grinding wheel carried thereby, a regulating wheel carried by the bed, a prime mover, a counter shaft driven by the prime mover,

transmission means coupling the counter shaft with the grinding wheel for rotating same thereby, an hydraulic pump, transmission means coupling the pump with the counter shaft for driving same thereby, and means driven by the pump for effecting the rotation of the regulating wheel, a slide supporting one of the wheels for movement relative 'to the bed and toward and from the other wheel, and means for effecting said movements of the slide driven by the pump.

17. In a centerless grinder the combination of a bed or support, a grinding wheel carried thereby, a regulating wheel carried by the bed, a prime mover, a counter shaft driven by the prime mover, transmission means coupling the counter shaft with the grinding wheel for rotating same thereby, an hydraulic pump, transmission means coupling the pump with the counter shaft for driving same thereby, and means driven by the pump for effecting the rotation of the regulating wheel, a slide supporting one of the wheels for movement relative to the bed and toward and from the other wheel, means for effecting said movements of the slide driven by the pump and means for reconditioning the active face of the grinding and regulating wheel operatively connected with the pump.-

18. In a centerless grinder the combination of a bed or support, a grinding wheel carried thereby, a regulating wheel carried by the bed, a prime mover, a counter shaft driven by the prime mover,

transmission means coupling the counter shaft with the grinding wheel for rotating same thereby, an hydraulic pump, transmission means coupling the,pump with the counter shaft for driving same thereby, and means driven by the pump for effecting the rotation of the regulating wheel including an hydraulic motor, a shaft for the regulating wheel, means coupling the shaft with the motor for driving same at substantially, the same speed as the motor, and means for coupling. the motor with the shaft for driving same at a different speed.

CLEMENT BOOTH. FREDERICK S. HAAS. 

